The quality of your photo is not too great, but we may still get to a name. I think it could be helpful if you would repost your second photo but with the whole abdomen visible. There may be some pattern on it.

I'm almost 100% sure that your spider is a female Heteropoda venatoria (Sparassidae). This is one of several species that gets the common name "bananenspin" in The Netherlands. Even though it has a painful bite, it is not considered dangerous to humans.

I'll just add though, another roughly similar looking spider called Phoneutria fera should be widespread in The Guianas, and those can have medically significant venom. I'd suggest not putting fingers so close to a large bodied spider next time if not sure what it is!